# FRANK Solutions for Class 9 Maths Chapter 18 - Rectilinear Figures

Understand polygons with Frank Solutions for ICSE Class 9 Mathematics Chapter 18 Rectilinear Figures. Learn to use the correct theorems for calculating the sum of interior angles of a polygon or sum of exterior angles of a polygon. Also, practise how to calculate the measurement of each angle of a polygon with our chapter solutions.

Revising the Frank textbook solutions for ICSE Class 9 Maths can help you to brush up the concepts on how to find the number of sides of a given polygon. Further, if you have any doubts related to rectilinear figures, visit the ‘UnDoubt’ platform at TopperLearning for answers from experts.

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## Chapter 18 - Rectilinear Figures Exercise Ex. 18.1

Question 1 Solution 1 Question 2 Solution 2 Question 3 Solution 3 Question 4 Solution 4 Question 5 Solution 5 Question 6 Solution 6 Question 7 Solution 7 Question 8 Solution 8 Question 9 Solution 9 Question 10 Solution 10 Question 11 Solution 11 Question 12 Solution 12 Question 13 Solution 13 Question 14 Solution 14 Question 15 Solution 15 Question 16(a)

Is it possible to have a polygon whose sum of interior angles is 780°?

Solution 16(a) Question 16(b)

Is it possible to have a polygon whose sum of interior angles is 7 right angles?

Solution 16(b) Question 17(a)

Is it possible to have a polygon whose each interior angle is 124°?

Solution 17(a) Question 17(b)

Is it possible to have a polygon whose each interior angle is 105°?

Solution 17(b) Question 18

A heptagon has three angles equal to 120°, and the other four angles are equal. Find all the angles.

Solution 18 Question 19 Solution 19  Question 20

In a polygon, there are 3 right angles and the remaining angles are equal to 165°. Find the number of sides in the polygon.

Solution 20 Question 21

ABCDE is a pentagon in which AB is parallel to DC and Find angle A.

Solution 21  Question 22

If the difference between an exterior angle of a regular polygon of 'n' sides and an exterior angle of another regular polygon of '(n + 1)' sides is equal to 4o; find the value of 'n'.

Solution 22 Question 23

The number of sides of two regular polygons are in the ratio 2 : 3 and their interior angles are in the ratio 9 : 10. Find the number of sides of each polygon.

Solution 23 Question 24 Solution 24 Question 25 Solution 25 Question 26 Solution 26 Question 27 Solution 27 Question 28 Solution 28 Question 29 Solution 29 Question 30 Solution 30 Question 31 Solution 31 Question 32 Solution 32 Question 33 Solution 33  Question 34 Solution 34  Question 35

In a regular pentagon PQRST, PR = QT intersect at N. Find the angle RQT and QNP.

Solution 35  Question 36

Each exterior angle of a regular polygon is times of its interior angle. Find the number of sides in the polygon.

Solution 36 Question 37

Each interior angle of a regular polygon is 162°. Another regular polygon has number of sides double the first polygon. Find each interior angle of the second polygon.

Solution 37 ### STUDY RESOURCES

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